Terrestrial record of rapid mass movements in the Sawtooth Range, Ellesmere Island, Northwest Territories, Canada
Widespread clastic deposits, 80-1800 m long, on the eastern side of the Sawtooth Range are the result of debris flow and slushflow. Small hillslope debris flows (10-10 3 m 3 ), originating on talus slopes at the mountain front and not associated with preexisting gullies, and large channelized debris...
Published in: | Canadian Journal of Earth Sciences |
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Language: | French |
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1998
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crcansciencepubl:10.1139/e97-086 2023-12-17T10:29:42+01:00 Terrestrial record of rapid mass movements in the Sawtooth Range, Ellesmere Island, Northwest Territories, Canada Lewkowicz, Antoni G Hartshorn, James 1998 http://dx.doi.org/10.1139/e97-086 http://www.nrcresearchpress.com/doi/pdf/10.1139/e97-086 fr fre Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 35, issue 1, page 55-64 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1998 crcansciencepubl https://doi.org/10.1139/e97-086 2023-11-19T13:39:10Z Widespread clastic deposits, 80-1800 m long, on the eastern side of the Sawtooth Range are the result of debris flow and slushflow. Small hillslope debris flows (10-10 3 m 3 ), originating on talus slopes at the mountain front and not associated with preexisting gullies, and large channelized debris flows (10 3 -10 4 m 3 ), debouching from basins within the mountains, are comparable morphologically to those in other high-latitude and high-altitude environments. Channelized deposits are often modified by the effects of slushflow and fluvial activity. Provisional lichen growth curves for the area were produced by correlation of thallus size with the enlargement of ice-wedge polygon troughs. Lichenometry and aerial photograph interpretation were used to estimate the age of deposits so that event frequencies and rates of geomorphic work could be calculated. Vertical transport by rapid mass movements during the 20th Century averaged 17 x 10 3 Mg ·m ·a -1 ·km -2 ( ± half an order of magnitude), corresponding to a rock denudation rate of 0.05 mm ·a -1 for the basins and peaks feeding the east-facing slopes. Channelized debris flow produced more than 70% of this transport. Several of these large flows occurred in each of the three periods of 30-35 years examined, so their recurrence intervals are substantially shorter than values reported from locations in northern Scandinavia and Spitzbergen. Article in Journal/Newspaper Ellesmere Island Northwest Territories Spitzbergen Canadian Science Publishing (via Crossref) Northwest Territories Ellesmere Island Canada Canadian Journal of Earth Sciences 35 1 55 64 |
institution |
Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
French |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Lewkowicz, Antoni G Hartshorn, James Terrestrial record of rapid mass movements in the Sawtooth Range, Ellesmere Island, Northwest Territories, Canada |
topic_facet |
General Earth and Planetary Sciences |
description |
Widespread clastic deposits, 80-1800 m long, on the eastern side of the Sawtooth Range are the result of debris flow and slushflow. Small hillslope debris flows (10-10 3 m 3 ), originating on talus slopes at the mountain front and not associated with preexisting gullies, and large channelized debris flows (10 3 -10 4 m 3 ), debouching from basins within the mountains, are comparable morphologically to those in other high-latitude and high-altitude environments. Channelized deposits are often modified by the effects of slushflow and fluvial activity. Provisional lichen growth curves for the area were produced by correlation of thallus size with the enlargement of ice-wedge polygon troughs. Lichenometry and aerial photograph interpretation were used to estimate the age of deposits so that event frequencies and rates of geomorphic work could be calculated. Vertical transport by rapid mass movements during the 20th Century averaged 17 x 10 3 Mg ·m ·a -1 ·km -2 ( ± half an order of magnitude), corresponding to a rock denudation rate of 0.05 mm ·a -1 for the basins and peaks feeding the east-facing slopes. Channelized debris flow produced more than 70% of this transport. Several of these large flows occurred in each of the three periods of 30-35 years examined, so their recurrence intervals are substantially shorter than values reported from locations in northern Scandinavia and Spitzbergen. |
format |
Article in Journal/Newspaper |
author |
Lewkowicz, Antoni G Hartshorn, James |
author_facet |
Lewkowicz, Antoni G Hartshorn, James |
author_sort |
Lewkowicz, Antoni G |
title |
Terrestrial record of rapid mass movements in the Sawtooth Range, Ellesmere Island, Northwest Territories, Canada |
title_short |
Terrestrial record of rapid mass movements in the Sawtooth Range, Ellesmere Island, Northwest Territories, Canada |
title_full |
Terrestrial record of rapid mass movements in the Sawtooth Range, Ellesmere Island, Northwest Territories, Canada |
title_fullStr |
Terrestrial record of rapid mass movements in the Sawtooth Range, Ellesmere Island, Northwest Territories, Canada |
title_full_unstemmed |
Terrestrial record of rapid mass movements in the Sawtooth Range, Ellesmere Island, Northwest Territories, Canada |
title_sort |
terrestrial record of rapid mass movements in the sawtooth range, ellesmere island, northwest territories, canada |
publisher |
Canadian Science Publishing |
publishDate |
1998 |
url |
http://dx.doi.org/10.1139/e97-086 http://www.nrcresearchpress.com/doi/pdf/10.1139/e97-086 |
geographic |
Northwest Territories Ellesmere Island Canada |
geographic_facet |
Northwest Territories Ellesmere Island Canada |
genre |
Ellesmere Island Northwest Territories Spitzbergen |
genre_facet |
Ellesmere Island Northwest Territories Spitzbergen |
op_source |
Canadian Journal of Earth Sciences volume 35, issue 1, page 55-64 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e97-086 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
35 |
container_issue |
1 |
container_start_page |
55 |
op_container_end_page |
64 |
_version_ |
1785582159881306112 |